24520421 has 2 divisors, whose sum is σ = 24520422. Its totient is φ = 24520420.

The previous prime is 24520387. The next prime is 24520427. The reversal of 24520421 is 12402542.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17556100 + 6964321 = 4190^2 + 2639^2 .

It is a cyclic number.

It is not a de Polignac number, because 24520421 - 2¹⁴ = 24504037 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 24520393 and 24520402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (24520427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12260210 + 12260211.

It is an arithmetic number, because the mean of its divisors is an integer number (12260211).

Almost surely, 2^24520421 is an apocalyptic number.

It is an amenable number.

24520421 is a deficient number, since it is larger than the sum of its proper divisors (1).

24520421 is an equidigital number, since it uses as much as digits as its factorization.

24520421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 24520421 is about 4951.8098711481. The cubic root of 24520421 is about 290.5199589716.

Adding to 24520421 its reverse (12402542), we get a palindrome (36922963).

The spelling of 24520421 in words is "twenty-four million, five hundred twenty thousand, four hundred twenty-one".